Revolving harrow.



0. O. TV ETEN. REVOLVING HARBOW. APPLICATION FILED JUNE 13, I917- Patented Jan. 1

WITNESSES 0 Jam? ATTOHNEV 0. 0. TVETEN.

REVOLVING HARROW.

7 APPLICATION FILED JUNE 13, I917. L wfifl Patented. Jan. 15,1918.

2 SHEETS-SHEET 2- v INVENTOH vqnrmassss U/Quor 0i Z212 m Mmmmv ANT :OLAUS- 0. TVETEN, OF GRAND FORKS, NORTH DAKOTA.

REVOLVING HARROWQ Application filedJune 13, 1917. Serial No. 174,546.

To all whom it may concern:

Be it known that I, 'OLAUs O. TVETEN, a citizen of the United States, residing at Grand Forks, in the county of Grand Forks and State of North Dakota, have invented certain new i and useful Improvements in Revolving Harrows, of whichthe following is a specification. 4

This invention relates to an improved harrow of the horizontally revolving wheel type and the principal object-of the invention is to provide an improved means for mountingthe two carrying wheels for rotary movement and for vertical adjustment and to further provide an'improved frame construction for the harrow upon which the driver may ride and in"which-the drivers seat will be so locatedthat easy access will be hadto the levers controlling-the revolving harrow. V 1

Another object of the inventionisto provide a frame which will be stronglybraced and the harrowing means sounounted that the machine will be relievedofstrain and prevented from injury.

vide improveddriving means for therevolving barrows, these means bein so constructed that motion may be transmitted to therevolving harrows at different speeds." This invention isillustrated in the accompanying drawings, wherein z-A- Figure 1 isa view showing the improved harrow, in side" elevation, I

Fig. 2 is a top planviewof the improved harrow,

Fig. 3 is" transverse sectional view through "the improved harrow,

Fig. 4 is a sectional view through a-pawl and ratchet clutch associatedjwith one of the wheels of the harrow, and Fig. '5 is a sectional view taken along the line 5-5 of Fig. 4. This harrow is provided with a frame having side bars 10 and end bars 11 and '12,

I ratchet 1S haVing-itsteeth engaged by the Specification of Letters Patent.

from the plate or collar 21'of the shaft 16.

Springs 22 are connected with this plateil and engage the pawls to yieldably hold the pawls in engagement with the teethofthe ratchet 18. It will thus be seen that when thelnachine is drawn across the field, rotary movement will be transmitted to the axle or driving shaft 16. If in turning around the wheels. rotate rearwardly instead of forwardly the pawls will slip past the teeth and the axle will remain stationary; It is of course understood that if desiredyboth wheels could be provided with the ratchet extensions and a pawl carrying collar placed at each end of the shaft if so desired.

WVithin the outer frame'of this carriage there is provided an inner frame, having the outer frame in any suitable manner.

'A bridge-25 extends transversely above the inner and outer: framesandhas its end portions connected with the standards 26 and has its'intermediate portion braced bytheyoke 27. Inorderto brace the side bars oftheinner. and outer frame, there have been providedcross bars 28 the intermediate one of which carries the standards or" arms 29 for the seat 30and the foot support-31. The driven shaft 32 rotatably mounted inbearings 33 and in the upperportions of the standards 26 and carries gears 34 and a sprocket wheel 35 about which passes a sprocket chain 36 passing about one of the sprocket wheels 37, 38and 39 mounted upon the axle or driving shaft 16, It should be noted that the sprocket wheels 37, 38 and 39 are of diiierent size and that therefore the rate of rotation of the shaft 32 with respect to the shaft 16 can be controlled by shifting the sprocket chain 36 from one sprocket wheel ofshaft 16 to the other. In order co tighten, the sprocket chain'after being moved from one sprocket wheel of the shaft to another, there has been providedalatch lever 10 pivotally mounted upon the bracket 41 at the upper end of which there is provided a rack e25 This latch lever is mounted upon a rocker shaft 13 rotatably mounted by the bracket 11 and the bracket 44 and carries an arm eh" extending forwardly and having at itsfree end a sprocket'wheel 16 whiclrengages the lower flight of the sprocket chain 36 and will draw Patented Jan 15,1913@ the lower flight downwardly to tighten the i chain when the latch lever is moved forwardly to the position shown in Figflf The drums or framesl li' which carry the harrow teeth 48 are rigidly mounted at the lower ends of the sleeves 4L9 which sleeves are keyed to the vertical shafts 50 as shown 52 meshing with the gears 3% and when the machine is in operation, the drums 4? will be rotated thus causing the teeth to break up the lumps .of dirt 'in afield. Rocker shafts 53 are mounted in bearings ,ol beneath the carriage, the nnerbearmgs providing racks for en a ei'nent'b I the latch levers mount ed upon the rocker shafts'53. These rocker shafts carry .arms or forks 56 which .forks engage the collars 5( at the upper ends of the sleeves 5L9 and whenthe latch levers are moved rearwardly from the position shown in F ig. 1, the rocker shafts will be rotated to swing the arms ofiupwardly thus raising the drums 47 out 'of engagement with the ground. It will therefore be seen that when turningat the end of the fielchthe barrow I drums may beraised out of engagement with the ground and of course, it will also be seen that when traveling-across. a" field, .one or.

both of the drums may be raised to permit offpassage over arock or other obstruction in the field. This Will further permitof the drums being raised when, moving the machine from one field to anothen X .When in use, the machine will be driven to the field where it is to be'used with the toothcarrying drums in a raised position 7 lower flight of the chain and tighten the chain the desired amount. After the chain has been tightened, the lat chrleversy55; willbe moved to lowerthe drums 4.7- and' when lowered a sufficient amount to permitflthe teeth to dig xi nto the 1 ground the desired extent, the latchesof these levers will be released andpermitted' to engage the rack 56 thus securely holding the drums atvthe 'dev sired point ofadjustment. fAs the machine is driven across the field, rotary movement will'betransmitted from the shaft 16 to the vertically extending shaft 50 and the drums will'thus be rotated and the teeth carried thereby will out the lumps of plowed earth into small particles. V

H Itwill thus be seen that there ;has been provided a very efficient harrow of the horizontally rotatable type.

kw at' s animals i V ifig'arear axle constituting a driving shaft, isupportmgwheels mounted upon the rear axle and having connection with the rear 'akle for" rotating the same, a driven shaft riedby the carriage and constituting a driv--- 7 ing shaft, abridge structure carried by the carriage, a driven shaft rotatably supported by the bridge structure, means? for transmitn otary tef' v ent IQ nt Q driv g; shaftto the driven shaft, vertica'lly extendin gshafts rotatably mounted and receivingrotary movement -from the driven "shaft, tooth carrying drums, sleeves extending. from the tooth carrying drums and slidably fitting upon thevertically extending shafts, rotatably mounted rocker shafts, arms exendin rbmthe 'q ke ha a nnected witl the;sleeves, and" levers connected with the rocker shafts for rotating thes'ame and sit ringing the arms vertically to; vertily adju' h drum a d; r leasa lri l the drums in vertically'Iadjusted positien. H

A i r vsi -mpri in a sa age, s dards connected with the earriage .and' exe ding above thes m bri se m eictins the standards abovethe earriage;adriv en shaft rotatably' supported thestandards, vertically extending shafts extending through the bridge, gears carried by the vertically extending shafts and driven shaft and engaging to transmit rotary movement of the driven shaft to the vertically vere tending shafts-tooth carrying drums'slicb ably mounted upon the lower ,end portions of the vertically extending shafts, means for vertically, adjusting the drums and- 'releasably holding the drums in, vertically adjusted positions, and 1 means for transmitting rotary movement to the drivensha ft. I,

4. A liarrow comprisinga"lcarriage including-an outer frame, an inner frame, standards connected with the side portions of theouter frame, a bridge connecting the, standards, a support for the intermediate portion ofthe bridge connected with-the inner frame, vertically 'extending shafts eX- tending-"through the end portions of the bridge, a driven fshaft carried the standards,rmeans for transmitting rotary movement from the the driven shaft to the vertically extending shafts, ground engaging elements having engagement with the lower portions of the vertically extending shafts and rotating the same, and means for transmitting rotary movement to the driven shaft,

5. A harrow comprising a carriage, a supporting structure carried by the carriage, a driven shaft rotatably connected with the supporting structure, a wheel supporting axle for the carriage constituting a driving shaft, a sprocket wheel mounted upon the driven shaft, a plurality of sprocket Wheels mounted upon the driving shaft, a sprocket chain passing about the sprocket wheel of the driven shaft and a selected sprocket Wheel of the driving shaft, a rotatably mounted rocker shaft, an arm extending from the rocker shaft and provided with a sprocket wheel for engagement with the sprocket chain, a lever connected with the rocker shaft for rotating the same and swinging the arm to bring the sprocket wheel carried thereby into and out of engagement. with the sprocket chain, and movable earth working means having operative connection with the driven shaft.

6. A harrow comprising a carriage having an outer frame, an inner frame, a supporting structure carried by the inner and outer frames, a driven shaft carried by the supporting structure, vertically extending shafts having operative-connection with the driven shaft for rotation therefrom, tooth carrying drums having sleeves slidable upon the ver tically extending shafts, rocker shafts rotatably mounted between the inner frame and the outer frame, arms extending from the rocker shafts and engaging the sleeves, levers connected with the rocker shafts for rotating the same and swinging the arms vertically to vertically adjust the drums and releasably hold the drums in vertically adjusted positions, and means for transmitting rotary movement to the driven shaft.

7. A harrow comprising a carriage having a wheel carrying axle constituting a driving shaft, a driven shaft, vertically extending shafts rotated from the driven shaft, earth working means connected with the vertically extending shafts and vertically adjustable thereon, and means for transmitting rotary movement from the driving shaft to the driven shaft.

In testimony whereof I aflix my signature in presence of two witnesses.

OLAUS O. TVETEN.

Witnesses CHAS. S. GARVIN, PEARL VVENTL Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

